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A group of Midwestern Democrats is pushing for tariffs on products from countries that don't limit greenhouse gas emissions, a controversial step that the legislators say is needed to help American manufacturers survive expected emissions restrictions here.

The Democrats say the measure would level the playing field for U.S. factories, which will likely face increased energy costs due to global warming legislation backed by the Obama administration. The legislation narrowly passed in the House in June and is pending in the Senate, according to an Aug. 24 article in the Chicago Tribune.